diff options
author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2017-02-26 15:34:42 -0500 |
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committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2017-02-26 15:34:42 -0500 |
commit | 8e22e1b3499a446df48c2b26667ca36c55bf864c (patch) | |
tree | 5329f98b3eb3c95a9dcbab0fa4f9b6e62f0e788d /arch/powerpc/include/asm/stackprotector.h | |
parent | 00d3c14f14d51babd8aeafd5fa734ccf04f5ca3d (diff) | |
parent | 64a577196d66b44e37384bc5c4d78c61f59d5b2a (diff) |
Merge airlied/drm-next into drm-misc-next
Backmerge the main pull request to sync up with all the newly landed
drivers. Otherwise we'll have chaos even before 4.12 started in
earnest.
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Diffstat (limited to 'arch/powerpc/include/asm/stackprotector.h')
-rw-r--r-- | arch/powerpc/include/asm/stackprotector.h | 40 |
1 files changed, 0 insertions, 40 deletions
diff --git a/arch/powerpc/include/asm/stackprotector.h b/arch/powerpc/include/asm/stackprotector.h deleted file mode 100644 index 6720190eabec..000000000000 --- a/arch/powerpc/include/asm/stackprotector.h +++ /dev/null | |||
@@ -1,40 +0,0 @@ | |||
1 | /* | ||
2 | * GCC stack protector support. | ||
3 | * | ||
4 | * Stack protector works by putting predefined pattern at the start of | ||
5 | * the stack frame and verifying that it hasn't been overwritten when | ||
6 | * returning from the function. The pattern is called stack canary | ||
7 | * and gcc expects it to be defined by a global variable called | ||
8 | * "__stack_chk_guard" on PPC. This unfortunately means that on SMP | ||
9 | * we cannot have a different canary value per task. | ||
10 | */ | ||
11 | |||
12 | #ifndef _ASM_STACKPROTECTOR_H | ||
13 | #define _ASM_STACKPROTECTOR_H | ||
14 | |||
15 | #include <linux/random.h> | ||
16 | #include <linux/version.h> | ||
17 | #include <asm/reg.h> | ||
18 | |||
19 | extern unsigned long __stack_chk_guard; | ||
20 | |||
21 | /* | ||
22 | * Initialize the stackprotector canary value. | ||
23 | * | ||
24 | * NOTE: this must only be called from functions that never return, | ||
25 | * and it must always be inlined. | ||
26 | */ | ||
27 | static __always_inline void boot_init_stack_canary(void) | ||
28 | { | ||
29 | unsigned long canary; | ||
30 | |||
31 | /* Try to get a semi random initial value. */ | ||
32 | get_random_bytes(&canary, sizeof(canary)); | ||
33 | canary ^= mftb(); | ||
34 | canary ^= LINUX_VERSION_CODE; | ||
35 | |||
36 | current->stack_canary = canary; | ||
37 | __stack_chk_guard = current->stack_canary; | ||
38 | } | ||
39 | |||
40 | #endif /* _ASM_STACKPROTECTOR_H */ | ||